/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2018-2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Class
    Foam::regIOobject

Description
    regIOobject is an abstract class derived from IOobject to handle
    automatic object registration with the objectRegistry.

SourceFiles
    regIOobject.C
    regIOobjectRead.C
    regIOobjectWrite.C

\*---------------------------------------------------------------------------*/

#ifndef regIOobject_H
#define regIOobject_H

#include "IOobject.H"
#include "typeInfo.H"
#include "stdFoam.H"
#include "OSspecific.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //


namespace Foam
{

namespace functionEntries
{
    class codeStream;
}
namespace fileOperations
{
    class uncollatedFileOperation;
    class masterUncollatedFileOperation;
}

/*---------------------------------------------------------------------------*\
                         Class regIOobject Declaration
\*---------------------------------------------------------------------------*/

class regIOobject
:
    public IOobject
{
protected:

        //- Helper: check readOpt flags and read if necessary
        bool readHeaderOk
        (
            const IOstream::streamFormat PstreamFormat,
            const word& typeName
        );

        //- Construct and return an IFstream for the object.
        //  The results is NULL if the stream construction failed
        Istream* objectStream();

        //- To flag master-only reading of objects
        static bool masterOnlyReading;


private:

    // Private Data

        //- Is this object registered with the registry
        bool registered_;

        //- Is this object owned by the registry
        bool ownedByRegistry_;

        //- List of modification watch indices
        mutable labelList watchIndices_;

        //- eventNo of last update
        label eventNo_;

        //- Istream for reading
        autoPtr<ISstream> isPtr_;


    // Private Member Functions

        //- Return Istream
        Istream& readStream(const bool valid = true);

        //- No copy assignment
        void operator=(const regIOobject&) = delete;


public:

        //- Declare friendship with classes that need access to
        //- masterOnlyReading
        friend class functionEntries::codeStream;
        friend class fileOperations::uncollatedFileOperation;
        friend class fileOperations::masterUncollatedFileOperation;


    // Static data

        //- Runtime type information
        TypeName("regIOobject");

        static float fileModificationSkew;

        static int maxFileModificationPolls;


    // Constructors

        //- Construct from IOobject. The optional flag adds special handling
        //- if the object is the top-level regIOobject (eg, Time).
        regIOobject(const IOobject& io, const bool isTime = false);

        //- Copy construct
        regIOobject(const regIOobject& rio);

        //- Copy construct, transferring registry registration to the copy
        //- if registerCopy is true
        regIOobject(const regIOobject& rio, bool registerCopy);

        //- Copy construct with new name, transferring registry registration
        //- to the copy f registerCopy is true
        regIOobject(const word& newName, const regIOobject&, bool registerCopy);

        //- Copy construct with new IO parameters
        regIOobject(const IOobject& io, const regIOobject& rio);


    //- Destructor
    virtual ~regIOobject();


    // Member Functions

        // Registration

            //- Add object to registry, if not already registered
            //  \return true if object was already registered,
            //      or was newly registered
            bool checkIn();

            //- Remove all file watches and remove object from registry
            //  \return true if object was registered and was removed
            bool checkOut();

            //- Add file watch on object (if registered and READ_IF_MODIFIED)
            virtual void addWatch();

            //- Is this object owned by the registry?
            inline bool ownedByRegistry() const;

            //- Register object with its registry
            //- and transfer ownership to the registry.
            //  \return true if now ownedByRegistry
            inline bool store();

            //- Register object pointer with its registry
            //- and transfer ownership to the registry.
            //  \return reference to the object.
            template<class Type>
            inline static Type& store(Type* p);

            //- Register object pointer with its registry
            //- and transfer ownership to the registry.
            //  Clears the autoPtr parameter.
            //  \return reference to the object.
            template<class Type>
            inline static Type& store(autoPtr<Type>& aptr);

            //- Register object pointer with its registry
            //- and transfer ownership to the registry.
            //  Clears the autoPtr parameter.
            //  \return reference to the object.
            template<class Type>
            inline static Type& store(autoPtr<Type>&& aptr);

            //- Register temporary pointer with its registry
            //- and transfer ownership of pointer to the registry.
            //  After the call, tmp parameter changes from PTR to CREF.
            //
            //  \return reference to the object.
            template<class Type>
            inline static Type& store(tmp<Type>& tptr);

            //- Register temporary pointer with its registry
            //- and transfer ownership of pointer to the registry.
            //  After the call, the tmp parameter content is \em unspecified.
            //
            //  \return reference to the object.
            template<class Type>
            inline static Type& store(tmp<Type>&& tptr);

            //- Release ownership of this object from its registry
            //  \param unregister optionally set as non-registered
            inline void release(const bool unregister = false);


        // Dependency Checking

            //- Event number at last update.
            inline label eventNo() const;

            //- Event number at last update.
            inline label& eventNo();

            //- Return true if up-to-date with respect to given object
            bool upToDate(const regIOobject&) const;

            //- Return true if up-to-date with respect to given objects
            bool upToDate
            (
                const regIOobject&,
                const regIOobject&
            ) const;

            //- Return true if up-to-date with respect to given objects
            bool upToDate
            (
                const regIOobject&,
                const regIOobject&,
                const regIOobject&
            ) const;

            //- Return true if up-to-date with respect to given objects
            bool upToDate
            (
                const regIOobject&,
                const regIOobject&,
                const regIOobject&,
                const regIOobject&
            ) const;


            //- Set as up-to-date
            void setUpToDate();


        // Edit

            //- Rename
            virtual void rename(const word& newName);


        // Reading

            //- Return complete path + object name if the file exists
            //  in the case directory otherwise null. Does not search
            //  up if parallel. Can be overridden to provide this functionality
            //  (e.g. IOdictionary)
            virtual fileName filePath() const;

            //- Read and check header info
            bool headerOk();

            //- Return Istream and check object type against that given
            Istream& readStream(const word&, const bool valid = true);

            //- Close Istream
            void close();

            //- Virtual readData function.
            //  Must be defined in derived types for which
            //  re-reading is required
            virtual bool readData(Istream&);

            //- Read object
            virtual bool read();

            //- Add file watch for fileName on object if not yet watched.
            //  \return index of watch
            virtual label addWatch(const fileName&);

            //- Return file-monitoring handles
            inline const labelList& watchIndices() const;

            //- Return file-monitoring handles
            inline labelList& watchIndices();

            //- Return true if the object's file (or files for objectRegistry)
            //- have been modified. (modified state is cached by Time)
            virtual bool modified() const;

            //- Read object if modified (as set by call to modified)
            virtual bool readIfModified();


        // Writing

            //- Pure virtual writeData function.
            //  Must be defined in derived types
            virtual bool writeData(Ostream&) const = 0;

            //- Write using stream options
            virtual bool writeObject
            (
                IOstreamOption streamOpt,
                const bool valid
            ) const;

            //- Write using setting from DB
            virtual bool write(const bool valid = true) const;


        // Other

            //- Is object global
            virtual bool global() const
            {
                return false;
            }


    // Member Operators

        //- Copy assignment
        void operator=(const IOobject& io);


    // Housekeeping

        //- Write using given format, version and compression
        FOAM_DEPRECATED_FOR(2020-02, "writeObject(IOstreamOption, bool)")
        virtual bool writeObject
        (
            IOstream::streamFormat fmt,
            IOstream::versionNumber ver,
            IOstream::compressionType comp,
            const bool valid
        ) const;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#include "regIOobjectI.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //
